Amplifier problem please Help

Discussion in 'Homework Help' started by mehul0849, Apr 25, 2009.

  1. mehul0849

    Thread Starter New Member

    Apr 29, 2008
    Hi guys this is the Amplifier Design Problem Please help

    see attach file

  2. guitarguy12387

    Active Member

    Apr 10, 2008
    Do you have a specific problem in mind? Have you attempted at all yourself?

    I'd start by choosing how many stages you want to use and what topologies to use. Also, choose BJT/FET... but if you post your attempt and be more specific, we can better help you... but we're not going to just DO your HW for you...
  3. PRS

    Well-Known Member

    Aug 24, 2008
    That's alot of voltage gain. And your output is 1MHz. For any transistor -- BJT or FET -- gain goes down as frequency goes up. Therefore your strategy is to get a percentage of the overall gain with each stage.

    The Ft of the xistor is its bandwidth product. The greater the Ft, the more gain you can get out of each stage. Personally, I'd use BJTs because you get more gain from each stage. The typical transistor, say a 2N3904, has an Ft of 300MHz. If you can obtain xistors with a higher Ft, the better off you'll be, but the 2N3904 will do the job.

    Is that Ro spec 40 ohms? If so we're talking follower. What is RL? That's important.

    The relatively low Rin spec means use the first stage as a common emitter (assuming you use BJTs), and as many CE stages after that to get your total necessary gain. Remember to factor in an attenuation of .8v/v for the final stage.

    More it you want.